Ubuntu Networking :: Ethernet Suddenly Crash And Says "no Cable Connected"
Apr 1, 2011
Yesterday it was everything OK in my PC with Ubutnu 10.4 and WinXP. Suddenly Ethernet stop working at Ubuntu, all what happened in between was a change of user, I trying changin user again, restarting PC, switching the cable (I have two ethernet boards) and nothing happened. It is like a virus attack, I don't know. I am writing now from WinXP in the same computer. Ubuntu says that I have no cable connected, but as you can see I am connected in Windows
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Jun 23, 2011
I have a computer with grub installed, and nothing else. I'd like to install Debian on it without having to burn a CD. (and I don't have any flash disks.) It has a nice ethernet card, and I have another computer right next to it with an ethernet card. I also have an ethernet cable. However, I don't have any router free which I can mess with for these purposes. As I've looked up, apparently modern Ethernet cards don't need crossover cables, normal cables will work for this type of connection.
I've tried several different "tutorials" on how to set up a netboot server, but
None of them are complete. All of them assume that you understand how DHCP works, and that you can do things like set up a dnsmasq server. I don't understand the DHCP protocol, with submasks and whatnot (I know that it is the protocol for assigning computer network addresses, and that's it), and I don't think I should have to in order to simply connect two computers. All of the tutorials give you incomplete configuration files, and ask you to fill in things which I don't understand, and for me it doesn't make sense to customize these settings, as I just want to connect them and I really don't care what ip address the TFTP server has or whatnot. All of these assume that you are going through a router. I am not. When I try googling for ways to directly connect two linux computers with an ethernet cable, I can't even find instructions, just more references to "you need crossover cables".
So basically, I have two computers directly connected by ethernet cables. Tell me what packages I need to install, what the contents of my configuration files should look like, and what, if any, commands I need to run in order that when I turn on my second computer, and select network boot, it will start up a minimal debian system.
EDIT: Hmmm, it looks like I actually have a linux kernel installed too, but no root filesystem (so no other programs besides busybox).
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Oct 12, 2010
how I could file share, or make the whole Hard Drive (HDD) accessible to another computer. The two other computers I have are a Toshiba Laptop with Ethernet and USB, and a iMac Intel with Firewire, USB, and Ethernet. Putting these to use along with:
Three Ethernet Cables
Two Printer Peripheral USB Cables
The Two Computers
A 2GB Flash Drive
That is all I can think of right now. I do not want to use CDs. In a way, I would like to do a network boot. So, how do I get the whole HDD visible to the others computers (either/both) and be able to write to it? I want to put Xubuntu on it, and earse the rest of the Hard Drive. The computers getting this are the iMac G3s and the eMac G4. The eMac has 256MB RAM, 40GB HDD, and a 700MHz processor. Two iMacs have 128MB RAM, 40GB HDD, and a 600MHz Processor. The other iMac is the same as the rest but has a 500MHz processor.
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Sep 21, 2010
I am trying to run a cable from my wireless router over a 75ft cat6 cable to my bedroom. I don't get any connection on my end and I don't have any other ideas. I did setup a m0n0wall box just to try. I got the network led on my server to light up in my room but nothing more than that. Lastly, I tried adding a 5 port switch in my room and then connecting that to my server and nada.
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Jul 13, 2011
I am using Ubuntu Server version 10.4, and am trying to connect to the internet via an ethernet cable. This may and probably is incredibly simple, however, I could not find anything that pertains to it.
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May 4, 2011
I am using a cable modem wired to my PC via ethernet. My ISP is Road Runner, through Time Warner Cable.
I entered my IP address, Netmask, and DNS Servers into the network, not using DHCP. This was how I was able to achieve a network connection.
I am connected to the modem, but I cannot get internet.
Here are my stats:
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Apr 18, 2010
I am running Ubuntu Linux 9.10 on my laptop and desktop. I would like to transfer files from one to the other using an Ethernet Cross Over Cable. Is there software already installed in the bundle, that would allow me to setup network drives for each machine when the cable is connected. Also how would I setup the configuration.
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Apr 19, 2011
How can I find a MAC of hardware attached via ethernet cable? I have been working nicely with an industrial scanner that is controlled by a Linux PC via an ethernet cable, but the hard drive has died I need to get it working again. The problem is that the main PCB has a Realtek RTL8019AS ethernet controller chip: [URL] which I believe is used in the most basic way possible, applied straight off-the-shelf and unconfigured. To utilise the chip ARP commands are used to assign an IP address to the chips MAC address e.g. something like:
arp -s 192.168.2.5 00-05-a4-00-a8-f8
Unfortunately the actual MAC address was lost along with the HD Th only thing I could have a reasonable guess at is that the chip will have a default subnet of 255.255.0.0 or 255.255.255.0
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May 2, 2011
How do I make share internet connection with playstation 3 with Linux Mint? I have put ethernet cable between them.
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Aug 12, 2010
Version: Ubuntu 10.04 Relavant hardware: P5QL Pro built-in ethernet, cable modem with linksys wireless-G router (although problem is with ethernet connection, not wireless)
One minute my ethernet was working, and the next it stopped working. The only thing that I did between it working and not working was install electricsheep from Synaptic and then I shut down the computer. When I restarted a bit later, no ethernet connection shows up.
I checked the cables, made sure they are in tight.
My laptop connects using the same ethernet cable fine. So its not the cable or the router.
I reset the router and the computer at the same time. Still doesn't work.
I don't know where to even start with troubleshooting this sort of problem. Everything to the extent of my computer knowledge seems to be working fine.
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Feb 20, 2010
I'm a new user of Ubuntu, so i'm not that familiar with this OS. My wireless network is detected but when I'm entering my 128 bits WEP key, it doesn't connect at all. I have no clue where to start troubleshooting.
Here's some of my specs if that's of any help:
Computer is a Sony Vaio laptop model VGN-SZ370P
My wireless card is from Intel Corporation 82801G (ICH7 Family) USB UHCI Controller
The ethernet cable connection used to work before, but I fooled around with some commands and now seems to be disabled...
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Jan 28, 2011
OS: Maverick Ethernet driver: tested with sky2 an sk98lin This has been driving me crazy for the last few months: if I unplug ethernet cable while my laptop is on reconnecting it sometimes does not bring the connection back.
And once ethernet is gone nothing that I try seems to consistently bring it back. Rebooting, disabling/enabling the driver, disabling/enabling NIC in BIOS, changing driver from sky2 to sk98lin, deleting connection from Network Manager, resetting the router - nothing helps. It seems to come back randomly a few weeks later. Once I used live Ubuntu on a USB stick and ethernet came back not only on a live distro but then when I rebooted also on my main OS. But when I tried that trick next time ethernet was missing in the live distro as well.
Also once I was able to revive ethernet but compiling sk98lin driver, blacklisting sky2 and rebooting. Of course next time doing the same routine did not help. The thing is - ethernet works fine with either sky2 or sk98lin and I can unplug the cable and plug it back in most of the time without any issues. But then every so often - bang and I'm stuck with only wireless until ethernet suddenly starts working again.
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Feb 2, 2009
How can I find out programmatically if a cable has been removed from an ethernet connector where the interface is "up" ??? Without using ping of course.
Sidebar question, if I have two interfaces on the subnet how can I force a ping out a specific interface? Say, I have 192.168.5.14 and 192.168.5.13 and I want to throw a ping out *.13 and not *.14 ..
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Nov 13, 2010
I've recently bought a recycled computer for my office. The plan was to get an old cheap computer and use it to write LaTex documents but nothing else. However, I can't seem to get the thing to connect to the internet. I'm on a University network which has a funny setup but I don't think that's the problem.So here's the deal. I have tried this with 9.04, 10.04 and 10.10 and it hasn't worked. The computer recognizes the ethernet cable. If I issue the command "sudo mii-tool eth0" and get back "eth0: negotiated 100baseTx-FD, link ok". However, click on the networking logo on the top right, and click auto eth0, it tries to connect for about 30 seconds, then gives up. Unfortunately I'm pretty clueless when it comes to networking so I have no idea what to do to try to fix this.
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Dec 10, 2010
Using ubuntu 10.10 (pinguy OS) i connected an ethernet cable from my girl's macbook pro to her lenovo ideapad s10-3t to transfer some DS9 episodes onto it. new enough to linux to have not been able to figure out how to access the files on the mac, so i disconnected the ethernet, and the wireless hasn't worked since. tried everything i know, and googling for a while (as well as searching again on this forum) to no avail.
Just before linking the 2 computers via ethernet, the wireless worked fine on the ideapad, always had; but not so after the ethernet connection that did nothing other than apparently kill the wireless. an "lshw -C network" command tells me i have a BCM4313 wireless card, and *-network UNCLAIMED. also, if i launch "install additional drivers", i see that the proprietary driver is not active.
How could merely plugging in an ethernet cable that happened to be conncected to a MBP running OSX.6 do that? and will that happen again? i thought linux was supposed to play real nice with other OS's, so why did a simple file transfer kill my wireless connectivity? i have no access to internet via ethernet cable, so i cannot just download the driver i need now. shouldn't it still be in the computer still? somewhere? is there a simple solution to this, or has the wireless driver been wiped out by plugging in the ethernet? is this a bug that should be reported?
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Jul 15, 2011
Acer 5250-BZ475 laptop, fresh install of Ubuntu 11.04. Boots up beautifully as long as an ethernet cable is plugged in. Otherwise, I get to the login screen and have just enough time to start typing in my password before the entire system hangs hard - no mouse, no keyboard, can't even get to a terminal, nothing. Have to hard power off the machine.
It seems to be a problem with the wireless card trying to initialize, but there doesn't seem to be a bios option to disable wireless on this laptop, so I'm a bit at a loss as to how to fix this problem. By the way, wireless works fine if I boot up with a cable connected - I can see all the wireless access points in my area no problem. I just can't boot without a wired connection, which makes my laptop more or less useless when I'm away from home with it.
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Apr 1, 2011
A couple of days ago my internet connections suddenly became very slow/intermittant.
I thought the problem was at my DSL provider but after more checking the problem seems to be in Ubuntu/Linux somewhere.
Reason: I can dual boot with windows 7 and have no ptoblem at all. Also I tried a Ubuntu laptop on the same router ethernet port and it also works fine. So its not my hardware or my provider, and its not a general Ubuntu problem either.
There are no error messages in any of the /var/log files and ifconfig looks normal.
It seems to be a DNS problem as it's the initial connection to a host which often times out. If I get a connection, I can e.g. stream an radio station fine.
If I try to e.g. traceroute any host it times out (no reply).
Ubuntu 10.10 is totally up to date as of today.
I'm stuck! How can I troubleshoot this to find the cause?
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Jun 16, 2011
I installed Fedora today, and I automatically had internet connection, I never had do configure anything myself. Then, I was playing around with VPN for a good while (trying to set up the VPN connection to my University), and now, I suddenly lost my connection to the internet!
But only Fedora can't connect anymore, the Windows PC has connection as well as my Mac OS X (I dualboot Linux on my MacBook). The Ethernet connection works as well, when I unplug the cable, Fedora gives me a message, but I just don't get into the internet!
Does anyone have an ides what I have to do? I don't know anything about network connections and I'm new to Linux...
I already restarted the Computer, but that didn't work, and Google didn't really held either.
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Nov 12, 2010
I have a device (not a pc) connected to my pc via ethernet, it dose not show up in networks, I was hoping there was a way of scanning to detect for it, is there a way of seeing content of it is basically what I'm asking?
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Jul 19, 2011
I am unable to connect to the internet at work through the ethernet, previously working. I am not sure of the origin of this problem -- the result of an update or something that I did to the network settings.
In the NetworkManager applet is says Auto Ethernet is connected but I can't ping anything by name or ip address.
The wireless still works without any problem.
I have tried following some of the other threads on similar issues but the fixes proposed on them have not helped to date. And I may have mangled some of the settings files somewhat.
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Jun 5, 2011
I am using ubuntu (11.04) here, when i connect Bsnl broadband link(wired connection). Internet is connect automatically But unable to instal, upgrad and access Internet pages ..
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Jul 27, 2010
I have a reverse ethernet cable and I want to use it to connect a desktop 10.04 Lucid + laptop 10.04 Lucid
How do I do this ? I have no routers, no hubs. This is so I can transfer HD ISO backup files.
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Aug 6, 2009
I want to configure my ADSL but I don't know what should I do. Can you explain me How can I configure it?(I use fc10, ethernet cable <Asus Am608 ADSL modem)
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Jun 1, 2011
I just purchased an HP Pavilion p6710f desktop with an ralink wireless n card, and 11.04 won't recognize it in 'Additional Drivers'. I can't get it to an ethernet cable, and then check for more additional drivers (did this on an old laptop), so what can I do??
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May 15, 2010
I just installed a Brothers HL2170W printer on my desktop which is running Ubuntu 1004 I had no problem with the install and it is working. The problem is when I send a page to print it takes 5 minutes before it prints. if this is normal or if there is a fix. I have the printer connected with a USB cable.
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May 24, 2011
I installed Ubuntu 11.04 on my girlfriends laptop a couple days ago...had the Ethernet cable plugged in to do the install...loaded fine the first time after the install. Unplugged the Ethernet cable when I had the wireless network set up and it froze. Restarted and it wouldn't even load the desktop. Didn't make the connection at first...thought there was something wrong with Unity. After about a day and a half worth of searching Unity problems/desktop freezing and solutions, I stumbled across this:
Quote:
Do you have a Broadcom card? You have probably noticed the desktop works when you run Ethernet but it locks up when your wireless connection is active.
You'll need to upgrade the kernel to fix the issue. 2.6.39.0 did it for me.
11.04 just runs fine now.
This solution was to update the kernel, but that didn't work for me. Now I'm stuck.
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Jul 14, 2011
I've just installed Ubuntu Desktop and connected the ethernet cable, but I don't have network connectivity. Why?
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Mar 9, 2010
I just built my first pc, installed ubuntu 9.10 and tried connecting to the net through my ethernet cable and all that happens is it says cannot find server. Do I need to install network settings & if so what & where,or should it automatically detect them? As this is my first build I am a novice but am willing to listen & learn.
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May 29, 2011
I just connected my BlackBerry to Linux via USB cable. How do I know which device in /dev it actually is?
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Dec 1, 2010
I have linux system which receive data from other system having linux OS in that also. but i cannot send data on other system.
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